House of Chernigov in the context of "Kunigunda of Slavonia"

The Principality of Chernigov was one of the largest and most powerful states within Kievan Rus'. For a time the principality was the second most powerful after the Principality of Kiev. The principality was formed in the 10th century and maintained some of its distinctiveness until the 16th century. The Principality of Chernigov consisted of regions of modern-day Ukraine, Belarus, and Russia.